Why do most injectors fail?
Actually, most injectors donít
fail, they just become obstructed. During operation, the injector
pintle only moves 0.1mm and the fuel exits through a hole no larger
than the period at the end of this sentence. These small passages
become impacted by microscopic deposits. One such offender is Olefin
- found in all gasoline. Its hard deposits form on all injectors and
are caused by todayís higher engine compartment temperatures.
Why is cleaning a better option
COST . . .
Testing and ultrasonic cleaning of
each injector will eliminate the need to buy new injectors which
cost $75 to $160 each!
Our full service cleaning* ranges from $25.00 per injector for
port injectors to $45.00 per injector of throttle body injectors.
*Our service includes:
- Electric Testing
- Leak Testing
- Spray Pattern Analysis
- Flow Rate and Volume Testing
- Ultrasonic Cleaning
- Installation of New Filter Baskets
and Pintle Caps
- New Seals and O-Rings
- Test sheets on each injector
showing before and after measurements
- Quick turn-around
- Injectors restored to like new
EFFECTIVENESS. . .
Ninety percent of faulty injectors
can be restored to like-new condition through the testing and
ultrasonic cleaning process.
Isnít chemical cleaning just as effective?
Some service facilities do offer
chemical and/or "on-car" cleaning methods. Using harsh
chemicals to dissolve deposits can damage some injectors immediately
and may cause long term damage to oxygen sensors and catalysts. Both
GM and Nissan have issued technical bulletins warning technicians
against this potentially expensive mistake. Ultrasonic cleaning,
according to the Society of Automotive Engineers, is the most
effective and safe cleaning method.
Why bother with flow
testing first; canít they just be cleaned?
Measuring the delivery volume of each
injector before it is cleaned and again after cleaning insures
uniform distribution of fuel to each cylinder. An average
restriction for any given injector, before cleaning, is 8%. This
restriction results in a lean mixture at the oxygen sensor. The
overall result is a richer mixture for the entire engine, as well as
an emissions increase in hydrocarbons by 26%, and carbon monoxide by
16%! This hinders the carís performance, increases emissions, and
may lead to more expensive repairs.
Testing also pinpoints those
injectors which have either failed electrically or have pintle or
seat damage and truly need to be replaced.
is the best times to
- when they are diagnosed with a
- whenever they are already removed
for an engine repair.
- during the routine replacement of
injector seals as part of the 60,000 or 90,000 major service, as
recommended by Bosch.